Comparative study of different SPH schemes on simulating violent water wave impact flows
- 132 Downloads
Free surface flows are of significant interest in Computational Fluid Dynamics (CFD). However, violent water wave impact simulation especially when free surface breaks or impacts on solid wall can be a big challenge for many CFD techniques. Smoothed Particle Hydrodynamics (SPH) has been reported as a robust and reliable method for simulating violent free surface flows. Weakly compressible SPH (WCSPH) uses an equation of state with a large sound speed, and the results of the WCSPH can induce a noisy pressure field and spurious oscillation of pressure in time history for wave impact problem simulation. As a remedy, the truly incompressible SPH (ISPH) technique was introduced, which uses a pressure Poisson equation to calculate the pressure. Although the pressure distribution in the whole field obtained by ISPH is smooth, the stability of the techniques is still an open discussion. In this paper, a new free surface identification scheme and solid boundary handling method are introduced to improve the accuracy of ISPH. This modified ISPH is used to study dam breaking flow and violent tank sloshing flows. On the comparative study of WCSPH and ISPH, the accuracy and efficiency are assessed and the results are compared with the experimental data.
Key wordssmoothed particle hydrodynamics (SPH) ISPH water wave impact
Unable to display preview. Download preview PDF.
- Faltinsen, O. M., 1978. A numerical nonlinear method of sloshing in tanks with two dimensional flow, J. Ship Res., 22(3): 193–202.Google Scholar
- Koshizuka, S. and Oka, Y., 1996. Moving particle semi-implicit method for fragmentation of incompressible fluid, Nucl. Sci. Eng., 123(3): 421–434.Google Scholar
- Liang, D. F., Thusyanthan, N. M., Madabhushi, S. P. G. and Tang, H. W., 2010. Modelling solitary waves and its impact on coastal houses with SPH method, China Ocean Eng., 24(2): 353–368Google Scholar
- Pan, C. H., Xu, X. Z. and Lin, B. Y., 1993. Simulating free surface flows by MAC method, Estuary Coastal Engineering, (1–2): 51–58. (in Chinese)Google Scholar
- Pan, X. J., Zhang, H. X. and Lu, Y. T., 2008. Moving-particle semi-implicit method for vortex patterns and rolls damping of 2D ship sections, China Ocean Eng., 22(3): 399–407.Google Scholar
- Zheng, X., Ma, Q. W. and Duan, W. Y., 2012b. Simulation of breaking waves by using an improved SPH, Proc. 22nd Int. Offshore Polar Eng. Conf., Rhodes, Greece, 3, 1051–1056.Google Scholar
- Zhou, J. T., Ma, Q. W. and Yan, S., 2008. Numerical implementation of solid boundary condition in meshless methods, Proc. 18th Int. Offshore Polar Eng. Conf., Vancouver, Canada, 3, 16–23.Google Scholar